Topiramate is a reasonable off-label choice for alcohol use disorder and antipsychotic-induced weight gain.

Pregabalin is structurally related to gabapentin and is likely more effective for psychiatric disorders, especially generalized anxiety disorder (GAD) and social anxiety disorder. 

Atomoxetine is a nonstimulant attention-deficit/hyperactivity disorder (ADHD) treatment that carries no abuse potential, causes less insomnia and anxiety, and is unlikely to worsen tics.